JPH02148115U

JPH02148115U -

Info

Publication number: JPH02148115U
Application number: JP5857689U
Authority: JP
Priority date: 1989-05-19
Filing date: 1989-05-19
Publication date: 1990-12-17

Description

[Brief explanation of drawings]

第１図は本考案による像面湾曲補正装置の基本
構成例を示す図であつて、同図ａは象面湾曲補正
装置の概略構造を示す正面図、同図ｂはその側面
図である。第２図は本考案による像面湾曲補正装
置の別の基本構成例を示す図であつて、同図ａは
象面湾曲補正装置の概略構造を示す正面図、同図
ｂはその側面図である。第３図乃至第５図は第２
の変位拡大機構の保持部へシリンドリカルレンズ
を固定する手段の説明図である。第６図乃至第１
０図は本考案の原理を説明するための図、第１１
図乃至第１４図は本考案の前段技術を説明するた
めの図である。１……積層型圧電アクチユエータ、２……ベー
ス部材、３……第１の変位拡大機構、３ａ，３ｂ
……変位部、４……第２の変位拡大機構、５……
コ字型状の保持部、５ａ，５ｂ……固定手段、Ｃ
Ｌ……象面湾曲補正用シリンドリカルレンズ、Ｒ
……光軸。 FIG. 1 is a diagram showing an example of the basic configuration of a field curvature correction device according to the present invention, in which FIG. 1A is a front view showing the schematic structure of the field curvature correction device, and FIG. 1B is a side view thereof. FIG. 2 is a diagram showing another example of the basic configuration of the field curvature correction device according to the present invention, in which figure a is a front view showing the schematic structure of the field curvature correction device, and figure b is a side view thereof. be. Figures 3 to 5 are
FIG. 3 is an explanatory diagram of means for fixing the cylindrical lens to the holding part of the displacement magnification mechanism of FIG. Figures 6 to 1
Figure 0 is a diagram for explaining the principle of the present invention, Figure 11
Figures 1 to 14 are diagrams for explaining the first stage technology of the present invention. DESCRIPTION OF SYMBOLS 1... Laminated piezoelectric actuator, 2... Base member, 3... First displacement magnification mechanism, 3a, 3b
...Displacement part, 4...Second displacement magnification mechanism, 5...
U-shaped holding part, 5a, 5b...fixing means, C
L... Cylindrical lens for correction of image plane curvature, R
……optical axis.

Claims

[Scope of utility model registration request]

A substantially parallel light beam from a light source device is imaged as a long line image in a direction corresponding to main scanning, and the light beam is deflected by a rotating polygon mirror having a deflection reflection surface near the imaging position of the line image, and the deflected light beam is In a scanning optical device of the type in which the surface to be scanned is imaged as a light spot by an imaging optical system and the surface to be scanned is scanned with light, the imaging optical system A device for correcting field curvature in the main scanning direction or sub-scanning direction due to the system,
It is composed of a correction cylindrical lens disposed between the light source device and the rotating polygon mirror, and a displacement means for causing the cylindrical lens to perform a simple vibration in the optical axis direction in synchronization with optical scanning by the deflected light beam. The first displacement magnification mechanism includes a laminated piezoelectric actuator serving as a vibration source, a first displacement magnifying mechanism having displacement parts of two target structures that are symmetrically displaced in response to vibrations of the laminated piezoelectric actuator, and a plate-shaped elastic member. The cylindrical lens is supported at both ends by both displacement parts of the first displacement magnification mechanism, and the cylindrical lens is held by a U-shaped holding part formed in the center of the displacement part of the first displacement magnification mechanism. a second displacement magnifying mechanism that is elastically deformed by the displacement and displaces the cylindrical lens in its optical axis direction; 1. A field curvature correction device for a scanning optical device, characterized in that a belt-shaped fixing means extending along the belt is provided, and a cylindrical lens is held and fixed by the fixing means.